Hmmm. Mayhaps you should ask the guys over at the Acoustic/Classical thread, they seem like they'd know more.

But, I did Google it real quick, and it looks like Matrix is a legitimate guitar model by Ovation. So you're in good shape, 'cept maybe for the quality issues listed on Craigslist, but that's all your call.

And for $180, it's not too big of a risk (unless money's tight for you).